WHAT IS THE CVV2 CREDIT CARD SECURITY CODE?

Visa & MasterCard:
This number is printed on your MasterCard & Visa cards in the signature area of the card. (it is the last 3 digits AFTER the credit card number in the signature area of the card).

American Express:
American Express cards show the cvv2 printed above and to the right of the imprinted card number on the front of the card.